Hi, so far owncloud and nextcloud are still pretty much the same after their fork, however nextcloud seems to pursue a more complete personal cloud solution, with lots of other addons/apps like an openstreetmap or email UI. I use owncloud on a daily basis through my Cloudron and it is pretty good, especially given the file-syncing from my phone (Android). I did use seafile as well some time ago, but I found the UI quite a bit confusing, less focused on what I needed, which was file-syncing.